Pressure Stabilized Sampling Device

Abstract

The pressure stable sampling device of the present invention includes a sampling tube, a pressure stabilizing chamber, a control system and a gas monitoring instrument, the sampling tube is connected to the air inlet of the pressure stabilizing chamber, one path of the pressure stabilizing chamber is connected to a multi-branch pipe, and each branch pipe is connected to the gas monitoring instrument, the inlet end of the sampling tube is provided with a first flowmeter and a flow limiter in turn, the pressure stabilization chamber is connected with a vacuum pump through a ventilation pipeline, and a second flowmeter and a proportional regulating valve are installed on the ventilation pipeline. The pressure stabilization sampling device of the present invention The injection pressure can be maintained at a constant value to ensure the repeatability of the injection. The internal pressure of the instrument can be adjusted through the pressure stabilization chamber and the control device to maintain the internal pressure of the instrument at a constant value. The aerial survey flight altitude environment must be lower than this In the case of the value, there is no need to calibrate it, so as to realize the uncertainty caused by the pressure change caused by the altitude change of the aircraft, and improve the data accuracy of the gas monitoring instrument during aerial survey.

Description

technical field [0001] The invention relates to a voltage-stabilizing sampling device, in particular to a voltage-stabilizing sampling device used in aerial surveys. Background technique [0002] In aerial surveys, analytical instruments are usually used to monitor the concentration of gas samples. In order to accurately analyze and measure the concentration of gases, it is necessary to ensure that the sampling process has good repeatability (that is, the repeatability of multiple sampling gas monitoring results). The stable pressure during sample injection is an important condition to ensure the repeatability of sample injection, but in the aerial survey, due to the change of flight altitude, the real-time change of external pressure brings difficulties to control the sample injection pressure. [0003] The existing atmospheric environment gas monitoring instruments used on the ground can be placed in a specific environment (generally set to 0.6 atmospheric pressure on the ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention of this application is to solve the technical problems that the sampling pressure of the current atmospheric environment gas monitoring instrument is unstable when used in aerial surveys, the instrument pressure changes greatly, and cannot be calibrated, and provide a pressure stable sampling device

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